Any course with a realistic chance of getting a job.That rules out over 90% of courses.
Of course it depends if you have any "PULL" to turn your qualification into a job.
Like a daddy or uncle in a high position in a company who can either get you directly into the company or do a quid pro quo with a colleague in another company. I was amazed when I went to college how many of my fellow students in my particular course had these connections.....It was only when I came across the names of the directors in the companies in the target industries that it clicked with me ... and I can tell you that for all the guff about interview technique, grade of qualification etc etc that this "pulling" was very important as the "connected" students got positions first practically to a man/woman.Of course they had the qualification and good luck to them .Then they have "experience" and are more employable.This will be especially evident in a recession as jobs are tight.
In the public service canvassing isn`t allowed but you can be sure that some influence will be brought to bear somewhere along the line , as long as the candidate has the minimum qualification.
Healthcare professionals are/will be in high demand as people are living longer so maybe nursing or various therapists would be a good qualification.
A foreign language with another qualification would be a good idea also,but choose the language carefully.
Another idea would be to do a course that is in poor demand,because by the time you finish things might have turned around. You also need less points and have less students and competition in the classroom.
The location of the college,enjoyability of the course content, finance availability/cost etc etc are all important factors.